Motorists are advised that if they have travelled through the affected area, they should hose down their vehicle, preferably on grass. Motorcyclists who may have ridden through the area should also hose down their clothing immediately, before washing thoroughly.

People who have travelled along the Kwinana Freeway between Mill Point Road and South Terrace this afternoon should inspect their vehicle.

As a precautionary measure, people in the area should remain inside, out of the smoke or fumes, with doors and windows closed. Air conditioners should also be switched off.

People should stay away from the area. If you are already in the area take advice from emergency services personnel.

People with medical concerns should contact their local doctor or call Health Direct on 1800 022 222.

Avoid the area and be aware of fire and emergency services personnel working on site.

Kwinana Freeway exit to South Terrace, Como (southbound) has been closed.

Motorists are asked to avoid the area, reduce speed and be aware of fire and other emergency services personnel.

Road information may also be available by calling Main Roads WA on 138 138 or visiting www.mainroads.wa.gov.au

Firefighters are helping to make the area safe. ChemCentre and the Department of Environment and Regulation Pollution Response Unit are providing technical support to DFES.